[填空题]
A bungee jumper with0 i vwms36/hg6gir;wh 91 , ts,vo+rnd,0to bl5gzxtzunj 26l mass 65.0 kg jumps from a high bridge. After reaching his lowest point, he oscillates up and down, h9xu vojlbn5 21nz+ ,lto,0 s6,trztdgitting a low point eight more times in 38.0 s. He finally comes to rest 25.0 m below the level of the bridge. Calculate the spring stiffness constant and the unstretched length of the bungee cord.
spring stiffness constant$\approx$ N/m(Round to the nearest integer)
unstretched length of the bungee cord m